How to create circular and double rainbows

What is a rainbow? A rainbow is created when light refracts as it enters a raindrop. It then reflects off the back of the droplet and refracts again as it exits the water. This splits the colour spectrum and causes the rainbow to appear at 40-42 degrees at incoming light. It appears at this angle every time no matter where you stand or walk.

To show this Maddie Moate shows you how to create a single and a double rainbow, and then explains how rainbows are actually circular.